Telecommunications – Audience survey or program distribution use accounting
Patent
1995-10-26
1998-10-20
Urban, Edward F.
Telecommunications
Audience survey or program distribution use accounting
455 63, 348 1, H04B 1700
Patent
active
058261648
ABSTRACT:
A surveying technique transmits a combined signal made up of a programming signal and a surveying signal, both of which are in the audible range. The surveying signal is uniquely coded to identify a signal source such as a radio station or television channel. At the receiver, the surveying signal is separated from the programming signal and then modified so as to be reproduced outside the audible range for detection by a portable unit worn by a person being monitored for his listening and/or viewing habits. The detection of the inaudible survey signal by the portable unit identifies the signal source to which the person was tuned.
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